Car Seat Advice A car seat is one of the most important safety devices that you will ever buy for your child so it is worth choosing very carefully. The industry develops all the time and the testing that seats go through is extremely rigorous. Isofix, rear-facing car seats, impact cushions are just some examples of recent innovations. The golden rule though is that the car seat that you choose must fit safely in your car or indeed any car that you plan to use. Over 80% of car seats are incorrectly fitted so this is still by far the biggest factor in child safety.